What kind of oil does a Subaru manual transmission take?
Most Subaru manual transmissions require 75W-90 gear oil, with GL-4 as the preferred specification. GL-5 may be acceptable on some models, but you should verify the exact requirement for your year and model in the owner's manual or with a Subaru dealer.
Understanding the exact specification by model and year
Subaru has used several different 5- and 6-speed manuals across its lineup, and the recommended gear oil can vary. The general guideline is 75W-90 gear oil, with GL-4 as the standard target. Some transmissions list GL-5 as allowable, but GL-4 is typically the safest choice to protect synchronizers. Always confirm with the vehicle’s manual or official Subaru service information before buying.
Why the GL-4 vs GL-5 distinction matters
The additive packages in GL-4 and GL-5 differ, and certain synchronizers in some Subaru manuals are more compatible with GL-4. Using GL-5 when GL-4 is specified can potentially lead to slower or harsher shifting over time. If your manual allows GL-5, ensure the oil is appropriate for a manual gearbox with brass synchronizers and that you follow Subaru’s guidance.
To ensure accuracy for your specific vehicle, consult the owner's manual or Subaru's official service information for your exact year and model.
What to do next is straightforward: confirm the exact spec for your car, then choose a high-quality synthetic 75W-90 gear oil that meets the required GL rating. Do not use motor oil or automatic transmission fluid in a manual gearbox.
Before you buy, verify the exact grade and specification for your model and climate. The list below outlines practical steps to confirm the correct oil for your Subaru manual transmission.
- Locate your vehicle’s model year and transmission type in the owner's manual or on Subaru's support site.
- Look up the recommended gear oil specification (usually 75W-90 with GL-4; GL-5 may be listed only if explicitly allowed).
- Choose a reputable synthetic 75W-90 gear oil that meets the specified rating and is compatible with your climate.
- Avoid using motor oil, ATF, or non-specified fluids in the manual transmission.
- If in doubt, consult a Subaru dealer or a certified mechanic for VIN-specific guidance.
Concluding: The exact requirement can vary by year and model, but 75W-90 gear oil with GL-4 is the most common recommendation for Subaru manuals. Always verify the spec for your car to ensure smooth shifting and long-term reliability.
Summary
In practice, Subaru manual transmissions typically use 75W-90 gear oil, with GL-4 as the standard specification. GL-5 may be acceptable on some models if explicitly allowed by the manual, but GL-4 is usually the safer bet for preserving synchro performance. Always check the owner's manual or consult a Subaru dealer for your exact year and model, and choose a high-quality synthetic gear oil that meets the specified rating.
